THE SPECIES OF AEGLA — SCHMITT 475 



spines in A. paraiia and A. sanlorenzo, and not quite so prominent 

 one in A. prado. 



Anterior dorsal angle of epimeron of second (in lateral view, ap- 

 parent first) abdominal somite produced and well spined, anteroven- 

 tral margin about straight; the ventral angle is rounded off. 



Holotype. — The largest and best-developed male of a lot of nearly 

 200 specimens about equally divided between males and females taken 

 from the Rio lapo in the State of Parana, Brazil, October 1925. The 

 type, U.S.N.M. No. 80020, measures 28.5 mm. in length of carapace 

 and rostrum. 



Remarks. — The somewhat subdisciform palmar crest of this species 

 is so strongly reminiscent of that of A. odebrechtii (p. 487) that when I 

 first found this species in the field I thought I had found the species 

 described by Fritz Miiller, but the spined dorsal anterior epimeral 

 angles of our species at once set it apart from his odebrechtii., in 

 which these angles are rounded off and not spined. Moreover, the 

 rostral carina and the spined carpal ridge of A. castro are very dif- 

 ferent. The palmar crest is also very similar to that of A. odebrechtii 

 paulerisis, from which, however, our species may be distinguished by 

 the same characters that separate it from A. odebi^echtii. 



In the primarily 2-spined inner ischial margin the present species 

 has something in common with A. parana, sanlorenzo^ and prado., 

 and also, as suggested above, in the armature of the ventral margin 

 of the first ambulatory merus. In the first two of these species the 

 posterior of the two ischial spines is about or nearly equal to the 

 anterior one ; the first and third species appear to have no intervening 

 conical spines or nodules. On the other hand, in A. castro and in 

 A. sanlorenzo there usually seems to be an intervening nodule, or 

 small spine or two. In both A. prado and castro the posterior ischial 

 spine, even if well developed, is noticeably smaller than, often only a 

 fraction of the size of, the anterior one. 



Color. — In life, a rather uniform very dark olive all over, with 

 occasional suggestion of olive-green; suture lines a little muddy or 

 grayish owing to dirt held there; antennae colored like carapace; 

 antennules brownish gray, in part clay color. Prehensile margins 

 of fingers of chelae dark orange-chrome, lighter below flushing the 

 movable finger with color, with a bright spot at the articulation. 

 Distal half of ambulatory dactyls satum red to light orange-chrome 

 suffusing the dark gi^eenish basal half of the dactyls at the juncture 

 of the two colors. Under parts generally dirty white, central portion 

 of sternum sometimes with a faint touch of blue (?cerulean blue), 

 under side of ambulatory propodi and carpi and outer margin of 

 hands and maxillipeds dirty chromium green (for colors see Ridgway, 

 1886). 



